Receiving apparatus.



H. SHOEMAKBR. RECEIVING APPARATUS.

APPLICATION FILED JAN. 20,}906.

Batnted Nov. 3, 1908.

- imaran, y, g irei X n P; ii 1' a BTW? his in -El Pl lMl lrhNT @lr lrlioln HARRY SHOEMAKER, OF JERSEY CITY, ZYEW JERSEY, ASSlGNORTOINTERNATIONAL TELE- GRAPH CONSTRUCTION COMPANY.

ACORPORATION OF NEW YORK.

RECEIVING AFPARATUS.

Specification oi iietters Patent.

Patented Nov; 3, 1908.

Application filed. January 20, 1905, Serial No. 296,988

To all whom it may concern:

Be it known that l, HARRY STIOEM.\ KER, a citizen of the United States,residing at Jersey City, in the county of Hudson and State of .NewJersey, have invented a new and useful llcceivlng Apparatus,.ot whichthe following is a specification. 1

lily invention'rel ates to signaling systems more especially to those inwhichthe message is a, represented during transmission through thenatural media by Hertzian waves or electro-radiantenergy.

More particularly myinvention resides in the receiving apparatus for usein such systems, and comprises means whereby a record-' strument. Fig. 2is a diagrammatic view of a small primary cell associated with a localsource of electro-motive' force or current which cooperates with'theprimary cell to control or actuate the recording apparatus, or othersignal translating instrument.

. Referring to Fig. l, A representsa looped aerial conductor associatedwith an inductance L upon which are adjustable the two riders 1" and r.The rider 1 is connected to the foot of one leg of the loopedaerial-conductor, while the rider 9" connects with the earth at G andwith the two posit-iveelements of the two small primary cells B and B.Each of these primary cells comprises a cell 'excitant of any suitablecomposition, such as dilute sulfuric acid, caustic potash, etc. or maybe arranged in dry cell form. The elements by which the current leavesthe cells, and here termed the positive elements, consist preferablyofsmall platinum wires sealed in glass tubes and ground ofi' flush" sothat their end sections only contact the cell excitant. These wires arepreferably relatively small in diameter, as for example one anihtrvomils, three mils, or even more,

or even less than one mil. The other elements of each cell arepreferably of Zinc. It isto be understood however that the cell elementsare not limited to platinum and zinc, but that any suitable'materialsmay be used so long as they are dissimilar and therefore capable ofproducing an electro-motive force. In a circuit includingthc cells B andB in series is included a recording device, D, such as, the siphonrecorder or relay; or if desired it may be'a telephone receiver.

The condenser C is connected between the foot of one leg of the aerial Aand the negalive element of the cell B.

In operation, the cell. B may be considered as a primary cellwave-responsive device sub- ]ected to the electrical potential orcurrent conducted to it through the riders r and a". In the circuitincluding" the cells B and B and the recorder D all in series with eachother, the two cells B and B normally balanceeach other, or practicallybalance each other, and accordingly ivhen the cell B is subjected to theeffects of the received energy this balance is disturbed with resultant.

flow of current through the recording device or other instrument D. Thisarrangement ispractically adaptable for operation of a recorder or relaysince relatively great effects may be so obtained. The condenser C mayserve to prevent the flow of direct current from either of the cells Bor B's While this arrangement has been shown in connection with a loopedaerial conductor,

and in connection with an inductance, it is" to be'understood that itmay be employed in connection with any other type of aerlal condnctoy orarrangement of receiving C11- cuits.

a simple aerial conductor A is represented between which and the earth Gis connected a small primary celldetector B similar to that described inconnection with Fig. 1. ever a battery B In Fig. 2

with potentiometer re sistance R and rider 7" is employed to balance theefiect of the cell B. As shown, the battery B and the cell are balanced"and oppose eachother so that normally no cur rent flows through thedevice, relay, or other signal translating instrument D. Choke coils f,f, prevent the passage of the high frequency oscillation to thepotentiometer circuit.

In place of the second cell B howi What I claim is:

1.111 a wireless signaling system, a plurality of. sources ofelectro-niotive force or current balanced against each other, andadapted to be unbalanced by received 616C? tro-radiantenergy, and arecording instrument or signal translating signal instrument responsiveto. the unbalancing.

2. lVIeansfor. detecting electrical waves comprising a plurality ofprimary cell detectors connected in opposition to each other.

3. A wave-responsive device comprising a pair of practically similarsources of current of substantially equal energies connected inopposition to eachother.

4. Awave-responsive device comprising a pair of primary cells of minutepower con'- 'nected in opposition to each other.

5. In combination, a receiving circuit or conductor, a plurality ofsources of current of minute power associated therewith, andxa circuitincluding a signal translating instruin opposition to each other. v

6. In-combination, a receiving circuit or ment and said sources ofcurrent, connected conductor, a source iof current of minute;

power associated therewith as a wave-responsive device, a second'source'of current connected in opposition to saidwave-re sponsivedevice, and a signal translating instrument. I

(-. In combination, a receiving circuit or conductor, apriinary cell ofminute power associated therewith as ii wave-responsive device, and acircuit including said 'waveresponsive device asignaltranslatinginstrument and a source of current connectedin opposition to saidwave-responsive device.

8. In combination, a receiving circuit or conductor, a plurality ofsources of current conductor, a source of current of minute powerassociated therewith "as a "wave-responsive device, a second source ofcurrent connected in opposition to said waveresponsive device andbalanced against the Same, and a signal translating instrumentresponsive to unbalancing. a

10. In combination, a looped aerial conductor, opposed sources of energyas means .for :detecting electrical waves associated therewith, and asignal translating instrument included in circuit with said Wave-re-.sponsive devices. 1

ll; In combination; a receiving conductor, asource of energy associatedtherewith as a wave-responsive device,-a local source of current, andmeans for graduating said local source of current to balance. saidwave-responsive device, and a signal translating in -strument.

- 12.; In combination, a looped aerial conductor, means for adjustingthe effective length thereof, opposed sources ofenergy of minute powerasmeans for'detectiiig electrical. waves associated with the variableportion of said loop, and a signal translating instrument.

.iiiiiii'iY SHOEMAKER.

\Vitnesses AGNEs REID,

ALICE S. Miiizsii.

